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65cc568cf5
The alpha version of floor wrongly return sNaN for sNaN input. Fix that by checking for NaN and by returning the input value added with itself in that case. Finally remove the code to handle inexact exception, floor should never generate such an exception. Changelog: * sysdeps/alpha/fpu/s_floor.c (__floor): Add argument with itself when it is a NaN. [_IEEE_FP_INEXACT] Remove. * sysdeps/alpha/fpu/s_floorf.c (__floorf): Likewise.
55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
/* Copyright (C) 1998-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Richard Henderson.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <math.h>
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/* Use the -inf rounding mode conversion instructions to implement
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floor. We note when the exponent is large enough that the value
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must be integral, as this avoids unpleasant integer overflows. */
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float
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__floorf (float x)
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{
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if (isnanf (x))
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return x + x;
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if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */
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{
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/* Note that Alpha S_Floating is stored in registers in a
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restricted T_Floating format, so we don't even need to
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convert back to S_Floating in the end. The initial
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conversion to T_Floating is needed to handle denormals. */
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float tmp1, tmp2, new_x;
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__asm ("cvtst/s %3,%2\n\t"
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"cvttq/svm %2,%1\n\t"
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"cvtqt/m %1,%0\n\t"
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: "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2)
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: "f"(x));
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/* floor(-0) == -0, and in general we'll always have the same
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sign as our input. */
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x = copysignf(new_x, x);
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}
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return x;
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}
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weak_alias (__floorf, floorf)
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